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https://issues.apache.org/jira/browse/PDFBOX-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067014#comment-15067014
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Gladkovsky Gleb edited comment on PDFBOX-2729 at 12/21/15 8:10 PM:
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I've managed to create a visible signature on protected file. My initial goal 
is to protect file and sign it at one time, but it works for protected files 
too. My problem that I cannot sign problem document twice, without damaging 
first signature. 
I've attached my pdfs
Password is 111
Document content is irrelevant to the topic 




was (Author: gglad):
Password is 111
Document content is irrelevant to the topic 

> Can't sign encrypted PDF files
> ------------------------------
>
>                 Key: PDFBOX-2729
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2729
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Signing
>    Affects Versions: 2.0.0
>            Reporter: Cyril Bremaud
>            Assignee: Andreas Lehmkühler
>         Attachments: Scan0001.pdf, Scan0001_protected.pdf, 
> Scan0001_protected_signed.pdf
>
>
> It is not possible to sign an encrypted PDF document.
> More details here :
> [http://stackoverflow.com/questions/29232684/signing-an-encrypted-pdf-document-with-pdfbox-2-0-0]



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